Some suggestions Make sure you are running a 8 blade water pump and no more then 35-40% antifreeze. Get a Mopar rad if possible they are expensive but worth it. Be sure there is no exhaust restictions IE Mice nests etc from all the sitting Also the thermostat I pulled a broken one out of a car last week first one in decades If you are using aftermarket AFB design it is too lean, do yourself a favor and get a older Carter AVS or a Holley